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A tower stands at the centre of a cir...

A tower stands at the centre of a circular park. A and B are two points on the boundary of the park such that `A B""(=""a)` subtends an angle of `60o` at the foot of the tower, and the angle of elevation of the top of the tower from A or B is `30o` . The height of the tower is (1) `(2a)/(sqrt(3))` (2) `2asqrt(3)` (3) `a/(sqrt(3))` (4) `asqrt(3)`

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A tower stands at the centre of a circular park. A and B are two points on the boundary of the park such that A B""(=""a) subtends an angle of 60^@ at the foot of the tower, and the angle of elevation of the top of the tower from A or B is 30^@ . The height of the tower is (1) (2a)/(sqrt(3)) (2) 2asqrt(3) (3) a/(sqrt(3)) (4) asqrt(3)

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